Access to Astronomical Catalogues

J/MNRAS/354/708     Leo I VI photometry                      (Bellazzini+, 2004)
The distance to the Leo I dwarf spheroidal galaxy from the red giant branch tip.
    Bellazzini M., Gennari N., Ferraro F.R., Sollima A.
   <Mon. Not. R. Astron. Soc., 354, 708-712 (2004)>
   =2004MNRAS.354..708B
ADC_Keywords: Galaxies, photometry ; Photometry, UBVRI

Keywords: stars: Population II - galaxies: distances and redshifts - Local Group


Abstract:
    We present V and I photometry of a 9.4'x9.4' field centered on the
    dwarf spheroidal galaxy Leo I. The I magnitude of the tip of the Red
    Giant Branch is robustly estimated from two different datasets
    ITRGB=17.97 (+0.05-0.03). From this estimate, adopting
    [M/H]~-1.2 from the comparison of RGB stars with Galactic templates,
    we obtain a distance modulus (m-M)_0=22.02±0.13, corresponding to a
    distance D=254+16-19kpc.

Description:
    The data were obtained at the 3.52-m Italian telescope TNG (Telescopio
    Nazionale Galileo - Roque de los Muchachos, La Palma, Canary Islands,
    Spain). The observations were carried out over three nights (2001
    March 19-21). The photometric system used is Johnson-Kron-Cousins
    (Landolt's photometric standards).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table.dat         88    12626   Stars positions and magnitudes


Byte-by-byte Description of file: table.dat

   Bytes Format Units   Label     Explanations

   1-  5  I5    ---     Seq       Identification number
   8- 13  F6.3  mag     Vmag      Johnson V magnitude
  16- 20  F5.3  mag     e_Vmag    Uncertainty on V magnitude (DoPHOT)
  23- 28  F6.3  mag     Icmag     Cousins I magnitude
  31- 35  F5.3  mag     e_Icmag   Uncertainty on I magnitude (DoPHOT)
  37- 43  F7.2  pix     xpos      x position in the frame
  45- 51  F7.2  pix     ypos      y position in the frame
  53- 54  I2    h       RAh       Right ascension (J2000.0)
  56- 57  I2    min     RAm       Right ascension (J2000.0)
  59- 64  F6.3  s       RAs       Right ascension (J2000.0)
      66  A1    ---     DE-       Declination sign (J2000.0)
  67- 68  I2    deg     DEd       Declination (J2000.0)
  70- 71  I2    arcmin  DEm       Declination (J2000.0)
  73- 78  F6.3  arcsec  DEs       Declination (J2000.0)
  81- 88  A8    -----   Var       Carbon star name (1)

Note (1):
    -- CNN stands for [DB2002] Leo I CNN (Demers at al., 2002AJ....123..238D)
    -- ALWNN for ALW Leo II N (Azzopardi et al., 1985A&A...144..388A)


Acknowledgements: Michele Bellazzini, michele.bellazzini(at)bo.astro.it

(End)                                      Patricia Vannier [CDS]    20-Apr-2005